Evaluation is essential for all types of intervention

doi:10.1136/bmj.324.7332.300a

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Peter D Taylor, general practitioner (Peter.Taylor@GP-m82030.NHS.UK)

Pontesbury, Shropshire SY5 0RF

EDITOR—Clark's plea for home visits by health visitors to be excluded from evaluation by randomised controlled trials cannot be accepted.1 His objections—the limitations of meta-analyses, the problems of confounding particularly where complex social factors are involved, and the selection of outcome measures—apply to many other interventions. The …